散射對(duì)煤粉太赫茲光譜定量分析的應(yīng)用研究
[Abstract]:In the process of quantitative analysis of coal quality by terahertz spectral system, The air pores between pulverized coal particles and HDPE particles in the sample pressure lead to the scattering of terahertz wave, which leads to the error of the intrinsic absorption spectrum of the measured coal samples. The equivalent structure of pulverized coal particles and air pores is established according to the different forms of pulverized coal particles and air pores in the sample compression sheet. The scattering inside the sheet is studied by using Foldy-Twersky EFA theory and iterative Waterman-Truell EFA theory in the 2~3.5THz frequency range. The intrinsic absorption spectrum extraction model of coal samples was established, and the scattering correction of extinction spectra in terahertz domain was carried out for six kinds of pulverized coal-HDPE particle mixture samples with different particle sizes. The experimental results show that when the diameter of pulverized coal particles is less than 38.5 渭 m, the effect of air pores between HDPE particles on the extinction spectra of the samples is dominant, and when the particle size of pulverized coal particles is 38.5 ~ 55 渭 m, The extinction caused by pulverized coal particle scattering is close to that caused by air pore scattering. With the further increase of particle diameter, the influence of pulverized coal scattering on absorption spectrum is gradually enhanced and dominant. The correlation coefficient and root mean square error of absorption spectrum of coal sample before and after scattering correction show that the model in this paper can effectively reduce the influence of scattering in the particle size range below 105 渭 m on terahertz absorption spectrum of pulverized coal-high density polyethylene mixture. It provides a theoretical basis for the quantitative analysis of coal absorption spectra in terahertz region.
【作者單位】: 中國礦業(yè)大學(xué)信息與控制工程學(xué)院;江蘇師范大學(xué)物理與電子工程學(xué)院;
【基金】:國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0801808)資助
【分類號(hào)】:O433.4
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